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Ahh.. thats it.. I must have confused the details (it was a good 8 months ago that I read the info) I knew there was some measurement that was critical.. Distance from primary to secondary.. In which case, yes, Jason's design is better...
I don't see how a moving secondary could be seen as more convenient to the user however.. whether the camera moves to achieve focus, or the secondary moves to reach focus is of little consequence to the user at the end of the day. as long as its computer controlled, its all the same...
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